Pole-changer.



C..J. ERIGKSON. POLE CHANGER, APPLICATION FILED AUG.11, 190s 1,036,817. Patented Aug. 27, 1912.

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POLE CHANGER.

APPLICATION FILED AUG. 11, 1906; 1,036,81 '7.

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W gai 729% Patented Aug. 27, 1912.

UNITED STATES PATENT OFFICE.

CHARLES J. ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,-

TO FIRST TRUST AND SAVINGS BANK, TRUSTEE, OF CHICAGO, ILLINOIS.

POLE-CHANGER.

Specification of Letters Patent.

' which the following is a specification.

My invention relates to pole-changers for use in automatically converting the current of a battery or other source into an alternatingcurrent suitable for use, for example, in operating bells or ringers, such as the bells or ringers of a telephone system.

Generally stated the object of my invention is the provision of an improved and highly efiicient pole-changer.

Special objects of my invention are the provision of improved means for reversing the flow of current; the provision of improved means for mounting and operating the pendulum of a pole-charger; the provision of a pole-changer having an operating circuit which is entirely independent and distinct'from the generating circuit; and the provision of certain details and features of improvement and combinations tending to increase the general etficiency and serviceability of a pole-changer of this particular character.

T o the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a side elevation of a pole-changer embodying the principles of my invention, certain portions being shown in section to more clearly illustrate the construction. Fig. 2 is an end elevation of the'same. Fig. 3 shows the other end of the said pole-changer. Fig. at is a. diagram of the circuits of the said pole-changer.

As thus illustrated, my improved polechanger comprises a suitable support or body-frame A upon which is mounted a U-- shaped support or frame B. The electromagnets C, C are arranged horizontally in the same plane, and have their end portions suitably secured to the vertical portions 2) of the said frame. Upon the top of said frame the mounting D is adjustably secured in place by screws (1 and provided with a downwardly-extending spring 01 The pendulum E has its upper 'end secured to the said spring and its lower end provided with an adjustable weight 6. The said pendulum is provided with circuit-controlling or interrupter springs c, the longer of which bears against the stationary contact F, which latter is mountccl' in a suitable binding post The pendulum E carries the armature G, which latter is arranged in operative relation to the cores or pole-pieces of the electro-magnets. At the other end of the structure a bracket-piece II is secured to the top of the frame B. Bars 7) are provided on the said frame and serve as a point of pivotal connection or mountingfor the swinging armature I. This armature, it will be seen, carries the terminal springs i and i, which latter are held normally against the stationary contacts i and i these contacts being mounted in suitable binding posts i and 2'. This normal position of the armature I is maintained by a spring J which connects the upper end of the armature with the bracket-piece II. The normally disengaged stationary contacts K and L 'are mounted in binding posts is and Z, and are adapted to be engaged by the springs i 2', respectively, when the armature I is attracted by the electro-magnets.

Referring to Fig. 4t, it will be seen that the battery M is connected in series with Patented Aug. 27, 1.912.

the windings of the two electro-magnets, as

well as withthe contacts e and F. lNith this arrangement the electro-niagnets' attract the armatures G, and in so doing open the energizing circuit in which their coils or windings are included. The pendulum E then swings back and causes the contacts a and F to close together, thus restoring the energizing circuit; This more or less rapid interruption in the flow of energizing current through the electro-magnets is thus controlled by the armature G, the Whole constituting what is ordinarily known as an interrupter. This intermittent energizing of'the electro-magnets causes a correspond ing energizing of the armature I. It will alsn be seen by inspecting Fig. 4t that this operatingcircuit is independent of and totally distinct fromv the generating circuit N, which generating circuit includes the primary O of a transformer or inductioncoil. contact K are both connected'to the same As illustrated, the contact, i and the r side of the circuit at I. On the other hand the contacts i and L are both connected with the oppositeside of the circuit at Q.

The springs i and z" are connected respectively with the positive and negative poles of the battery M and normally engage the 5 contacts 2' and 2' as shown more clearly in Fi 4. When the armature I is at tracte however, then these springs engage the contacts L and K, and in this way the flow of current in thecircuit N is reversed. Normally, the current flows from the positive pole of the battery through the spring 2', then through the contact 2', through the Wiring of the circuit N, through the induction-coil winding 0, thence. through the contact 2' and the spring 2' to the negative pole of the battery. When the armature I is attracted the flow of current is then from the positive pole of the battery through the spring 2', through the contact L, through the wiring of the circuit N, through the said winding of the induction-mil, thence through the contact K and the spring i to the negative pole of the battery. In this way the rapid vibration of the armature I cause a constant reversal of the current in the circuit N nd a consequent inductive generation of air alternating current in the secondary R of. the said induction-coil,

which latter may be connected with the circuit or switches from which the alternating current is to be taken for any useful purpose. a

The frequency of the current developed by the pole-changer may be varied or changed by sliding the weight 6 up and down, or by varying the thickness of the spring al s may be desired. What I :him as my invent-ion is 1. In a pole changer, an operating circuit, a generating circuit, an interrupter in the operating circuit, electromagnets in said operating circuit provided with an armature for actuating said interrupter, an independent armature for said magnets provided with contacts controlling the generating circuit, and stationary contacts cotiperating with said armature contacts for causing an intermittent reversal of the flow of current in the said generating circuit, said last-mentioned armature being independent of the said interrupter, the two armatures being disposed at opposite ends of the magnets, said operating circuit being independent of rea er? anddistinct from the said generating circuit, for the urpose set forth.

2. In a po e changer, an operating circuit,

a generating circuit independent of and distinct from said operating circuit, an elec- I tromagnet provided with means including a plurality of armatures for cont-rolling both circuits, and a source of current. common to both circuits.

3. In a pole changer, an electromagnet, two independently operating armatures for said magnet disposed at opposite ends thereof, an interrupter operated by one of said armatures, current-flow reversing contacts operated by the other armature, apendulum carried by the armature which operates the interrupter, and circuit controlled by said armature.

4. In a pole changer, an electromagnet, means for energizing said magnet, an interadapted to intermittently interrupt the flow of energizing current through the magnet, an armature independent of said interrupter operated by said electromagnet,

rupter and intermittently attracted by the intermittent energizing of the electromagnet, a generating circuit, and contacts operated by said last-mentioned armature adapted for intermittently reversing the flow of current in said generating circuit, said 6. In a pole changer, a circuit interru ter, a circuit reverser, and a single ma net aving devices. for operating both t einterrupter and the reversed, which ,devices contures and contacts therefor. r

, Signed by me at Chicago, Cooboounty,

EDWARD D. FALEs, JoHN ERICKSON.

(topics of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents-- Washington, D. G.

'sist of two independently vibratory 'arma- 

